In California during deer hunting season you will find a lot of hunters in dispersed camps. You will frequently find a campfire ring that is used year after year by the same group of hunters.
My dad left a full sheet of exterior plywood at "his" camp. Each fall we would cut new legs and nail them to the plywood to create a table. At the end of the trip we took off the legs and stored the plywood vertically between two trees. It was buried in snow through the winter. I am not sure how long it lasted. My guess is about 10 years. I climbed a tall tree, as far as I dared, and hung an old broken coffee thermos I had found on the ground along with some red cloth. From Hat Mountain I was able to see it. I thought I knew the general direction and distance from Hat Mountain to camp. Boy, was I wrong. My marker in the top of the tree lasted more than 20 years.
As an example of where I have camped do a Google search for:
1. Monkey rock California. It is due north of Lake Pillsbury. From Lake Pillsbury to the nearest paved road in Potter Valley is 18 miles of dirt road. We got our water from Rattlesnake Creek, due east of Monkey Rock.
2. Hat Mountain California, due east of Likely and Blue Lake. From Blue Lake Campground to Hat Mountain, according to Google maps, it is 22.9 miles and will take an hour and a half to get there. About a third of that time will be traveling the last 5 miles. This requires 4wd and high ground clearance, essentially a pickup truck. The largest TT I have seen near there was about 20 feet long. Actually, that is the only TT I ever saw there in 20 years. Anything longer will not get there. Much of that last 5 miles will be in 4wd low range first and second gear. We got our water from a natural spring. Many years ago someone stuck a 3 inch galvanized water pipe into the hillside. The water came out of the pipe about 2 feet above the ground alongside a well known dirt road. This allowed you to stick a water container under it. This spring was about a mile from our camp. We would haul 20 gallons of water at a time.
Trivia question: What is the highest point in Lassen County California? Almost everyone that is familiar with Mt. Lassen, extinct (so far) volcano but that is incorrect. It is Hat Mountain.
It looks like you are nowhere near me. But I offer these two locations as an opportunity to "visit" some remote disperse camping areas.
I started dispersed camping at age 6 months, according to my mother. I really don't recall that first trip.
I will be happy to answer any question about my experiences with dispersed camping.